Photographic printing method and system
US5438389A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1994 |
| Grant date | Aug 1, 1995 |
| Priority date | — |
| Expiry date | Jun 14, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/735
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A film analyzer calculates exposure correction amounts for red, green, and blue colors in an image of an original frame of a spliced long film by using the characteristic values of a scene determined from the output of a color image sensor. For a low LATD frame having a minimum value of three-color LATDs smaller than a reference value, a density of an ND filter to be used for printing is calculated in accordance with a difference between the minimum value and the reference value. The long film is loaded into an auto-printer from the film analyzer. A photometry sensor measures three-color LATDs of an original frame set to a print station of the auto-printer. A print exposure time of each color is calculated from the three-color LATDs and exposure correction amounts. Immediately before the low LATD frame is set to the print station, an ND filter having the density determined in advance is inserted into a printing path. Three-color LATDs are measured while the ND filter is inserted into the printing path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.